Connected: An Internet Encyclopedia
RFC 821 - 4. THE SMTP SPECIFICATIONS

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### 4. THE SMTP SPECIFICATIONS

4.1. SMTP COMMANDS

4.1.1. COMMAND SEMANTICS
4.1.2. COMMAND SYNTAX

4.2. SMTP REPLIES

4.2.1. REPLY CODES BY FUNCTION GROUPS
4.2.2. NUMERIC ORDER LIST OF REPLY CODES

4.3. SEQUENCING OF COMMANDS AND REPLIES
4.4. STATE DIAGRAMS
4.5. DETAILS

4.5.1. MINIMUM IMPLEMENTATION
4.5.2. TRANSPARENCY
4.5.3. SIZES

Next: 4.1. SMTP COMMANDS

Connected: An Internet Encyclopedia
RFC 821 - 4. THE SMTP SPECIFICATIONS